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Abstract

Mode property of a kind of Terahertz (THz) polymer tubes including a
circular polymer tube (CPT) and an elliptical polymer tube (EPT) are
investigated in this paper. Low-loss property of the THz polymer tube is
achieved due to the ring-structure cross section of the polymer tube where
the central air core traps a large part of the mode power of the fundamental
guiding mode, where the air is almost lossless for THz wave. Effective
indexes, mode profile, single mode property, and relative absorption loss of
both the CPT and the EPT are presented. Simulation results show that the CPT
with a cross section of a circular ring structure exhibits better loss
property than a conventional solid polymer fiber. The EPT with a cross
section of an elliptical ring structure can achieve a high birefringence (up
to the order of 0.01), which is due to the effect of the continuity of the
electric displacement vector in the normal direction of the interfaces
between the polymer materials and the air in the cross section.

References

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